So having the Xonar DX and the Magni would be better than having my current card XI-FI Xtremegamer and a Magni?

 

nihl said:

  So having the Xonar DX and the Magni would be better than having my current card XI-FI Xtremegamer and a Magni?

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I would think it would be hard to justify replacing the Xtremegamer with an Xonar DX.
The slightly better DAC chip of the DX is off set by the fact the Xtremegamer's audio processor is considered by many to come with better FPS gaming features.
I would think it would be better to keep an eye out for a used (under $100) late model (Revision C) Ti-HD (Titanium HD) and use the Ti-HD with an external amplifier (Magni or other).
The Ti-HD's PCM1794 DAC chip is about the best DAC chip and op-amps you can get on a sound card.

I have a to ask something . The external headphone amp will effect 3d audio coming out from the computer ?

tsine said:

  I have a to ask something . The external headphone amp will effect 3d audio coming out from the computer ?

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The external headphone amplifier should work (in general) with any 3D audio (Headphone surround sound) coming out of a computer.
Better to plug the external headphone amplifier into the line-output on the sound card, not the amplifier headphone jack.
Sound cards like the older Creative Titanium series or Xonar DS/DSX/DX/D1 sound cards.